* {
        margin: 0;
        padding: 0;
}

body {
        background-color: black;
        color: #666;
        text-align: center;
}

audio {
        width: 450px;
        margin: 30px 0;
}
.content{
        height: 420px;
        /* border: 2px solid #fff; */
        overflow: hidden;
}
.content ul{
        /* border: 2px solid red; */
        transition: 0.2s;
        list-style: none;
}
.content li{
        height: 30px;
        line-height: 30px;
        transition: 0.6s;
}
.content li.active{
        /* font-size: 30px; */
        color:#fff;
        transform: scale(1.3);
}